Hmm... I will try to simulate the filename and folder structure to see what happens.
Update: Confirmed. I got some goofy @#(()*)_ errors when the code strips off the "!". After changing the code to not do that, I now get the Ah! My Goddess folder recognized as a series. However, "Find Series Info" reports that nothing could be found --which is clearly bogus. Still investigating.
Update 2: Turns there was HTML formatting tags inside the thetvdb overview that screwed up the xml parser. I just went to thetvdb.com and changed "<i>ONE</i> wish" to just " ONE wish". This xml problem is tied to how I parse the xml data. Changing how this is done is a pretty big undertaking that I don't want to tackle for awhile yet.
Anyhoo, I just confirmed that it will work as intended for AMG. I will post a new build for you in the next 30 mins that takes care of the "!" part of the problem. After I post this build can you delete all .metadata folders in AMG and in AMG\Season 1 then try again?